/**
 *    Copyright 2009-2020 the original author or authors.
 *
 *    Licensed under the Apache License, Version 2.0 (the "License");
 *    you may not use this file except in compliance with the License.
 *    You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 */
package org.apache.ibatis.type;

import java.sql.CallableStatement;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

/**
 * 类型处理器  实体类javaBean 和table字段之间类型处理
 *
 *
 * <configuration>
 *     <typeHandlers>
 *       <!--
 *           当配置package的时候，mybatis会去配置的package扫描TypeHandler
 *           <package name="com.dy.demo"/>
 *        -->
 *      handler属性直接配置我们要指定的TypeHandler
 *       <typeHandler handler=""/>
 *    javaType 配置java类型，例如String, 如果配上javaType, 那么指定的typeHandler就只作用于指定的类型
 *       <typeHandler javaType="" handler=""/>
 *      jdbcType 配置数据库基本数据类型，例如varchar, 如果配上jdbcType, 那么指定的typeHandler就只作用于指定的类型
 *       <typeHandler jdbcType="" handler=""/>
 *       也可两者都配置
 *       <typeHandler javaType="" jdbcType="" handler=""/>
 *   </typeHandlers>
 *
 *   ......
 *
 * </configuration>
 */
public interface TypeHandler<T> {

  void setParameter(PreparedStatement ps, int i, T parameter, JdbcType jdbcType) throws SQLException;

  T getResult(ResultSet rs, String columnName) throws SQLException;

  T getResult(ResultSet rs, int columnIndex) throws SQLException;

  T getResult(CallableStatement cs, int columnIndex) throws SQLException;

}
